It's never of any service to attempt to convince people that don't want to be convinced especially if they are wrong.The boys bench top milling machine both appealed to Jonas.I can't find any little openings, said Nathan.But iron is not compressible, and water is bench top milling machine not compressible.What is a cylinder? said Nathan.He filled it with hot air and the hot air was so light, that it rose up and carried bench top milling machine the paper ball with it.How high did it go? said Nathan.Well, bench top milling machine replied Jonas, you were both wrong.They took care not to pile the wood, in any case, higher than their shoulders, for Jonas had told them that, if they piled the wood higher than that, there would be danger of its falling down upon them.No, replied his father, the water cannot bench top milling machine be sensibly compressed.Yes, said Jonas, handsomely dressed.Well, bench top milling machine said his father, the water spouted out.What is the important difference between air and water, which was explained in the last chapter, and mentioned in this? Does the air tend to expand again after it is compressed? What is this property of the air called? Is the air around us already condensed, or is it in its natural state? What causes it to be condensed? Suppose a thin glass vessel were to be filled with air, and another with water, and the air suddenly removed from the room around them what would be the effects? What effect does heat have upon the expansibility of air? How may this effect be made to appear over a lamp? In a chimney? What was the story which Rollo's father told Nathan? CHAPTER VII.